1.

Architecture

The following figures show the simplified hardware architecture and firmware architecture of the PoE system based

on the PD39210 controller and PD39208 manager.

Figure 1-1. Simplified Hardware Architecture

PoE Manager

PD39208

PoE Controller

PD39210

Host

Microprocessor

SPI

I

UART

Figure 1-2. Simplified Firmware Architecture

PoE Manager

PoE Controller

P2.xx Firmware

Supports 802.3af/at

Host Microprocessor

GUI

Customer

Application

API

System

Services

Serial

Communication

Protocol

I

• Dark grey boxes indicate Microchip-supplied firmware.

• Light grey boxes indicate Microchip-provided documentation.

• White boxes are user-supplied.

1.1

Firmware

• Firmware is pre-programmed in PD39210. Firmware version is identifiable via the IC Ordering Part Number.

• Firmware is vendor-agnostic with regards to choice of the host controller.

• Default profiles are coded into the firmware. Microchip offers a Configuration Tool for profile modification.

1.2

Communication

Communication between the host application and the controller’s firmware may be done via a 15-byte protocol.

Customers may use a Microchip-provided API. Microchip provides a Serial Communication Protocol Guide.

1.3

GUI

This is a diagnostic tool for control of the Microchip PSE emulating or bypassing the host processor.

PD39210

Architecture

Datasheet

DS00003554C-page 4